NuSTAR observations of X-ray bursts from the magnetar 1E 1048.1-5937

Abstract

We report the detection of eight bright X-ray bursts from the 6.5-s magnetar 1E 1048.1-5937, during a 2013 July observation campaign with the Nuclear Spectroscopic Telescope Array (NuSTAR). We study the morphological and spectral properties of these bursts and their evolution with time. The bursts resulted in count rate increases by orders of magnitude, sometimes limited by the detector dead time, and showed blackbody spectra with kT=6-8 keV in the T90 duration of 1-4 s, similar to earlier bursts detected from the source. We find that the spectra during the tail of the bursts can be modeled with an absorbed blackbody with temperature decreasing with flux. The bursts flux decays followed a power-law of index 0.8-0.9. In the burst tail spectra, we detect a ~13 keV emission feature, similar to those reported in previous bursts from this source as well as from other magnetars observed with the Rossi X-ray Timing Explorer (RXTE). We explore possible origins of the spectral feature such as proton cyclotron emission, which implies a magnetic field strength of B~2X10^15 G in the emission region. However, the consistency of the energy of the feature in different objects requires further explanation.

arXiv comment10 pages, 6 figures, accepted for publication in ApJ

References in corpus (32)

• The Nuclear Spectroscopic Telescope Array (NuSTAR) Mission
• The McGill Magnetar Catalog
• Electrodynamics of Magnetars: Implications for the Persistent X-ray Emission and Spindown of the Soft Gamma Repeaters and Anomalous X-ray Pulsars
• Gravitational Bending of Light Near Compact Objects
• Untwisting magnetospheres of neutron stars
• A Major SGR-like Outburst and Rotation Glitch in the No-Longer-So-Anomalous X-ray Pulsar 1E 2259+586
• Explosive reconnection in magnetars
• The Discovery of an Anomalous X-ray Pulsar in the Supernova Remnant Kes 73
• Magnetar-like X-ray Bursts from an Anomalous X-ray Pulsar
• A variable absorption feature in the X-ray spectrum of a magnetar
• The Giant Flare of 1998 August 27 from SGR 1900+14: I. An Interpretive Study of BeppoSAX and Ulysses Observations
• A Swift gaze into the 2006 March 29th burst forest of SGR 1900+14
• Distances to Anomalous X-ray Pulsars using Red Clump Stars
• A Comprehensive Study of the X-ray Bursts from the Magnetar Candidate 1E 2259+586
• The dust-scattering X-ray rings of the anomalous X-ray pulsar 1E 1547.0-5408
• SGR J1550-5418 bursts detected with the Fermi Gamma-ray Burst Monitor during its most prolific activity
• Temporal and Spectral Characteristics of Short Bursts from the Soft Gamma Repeaters 1806-20 and 1900+14
• Diagnosing magnetars with transient cooling
• X-ray Bursts from the Transient Magnetar Candidate XTE J1810-197
• RXTE Monitoring of the Anomalous X-ray Pulsar 1E 1048.1-5937: Long-Term Variability and the 2007 March Event
• Timing and Flux Evolution of the Galactic Center Magnetar SGR J1745-2900
• The 2009 outburst of magnetar 1E 1547-5408: Persistent radiative and burst properties
• Unraveling the cooling trend of the Soft Gamma Repeater, SGR 1627-41
• X-ray and Near-IR Variability of the Anomalous X-ray Pulsar 1E 1048.1-5937: From Quiescence Back to Activity
• The 2006-2007 Active Phase of Anomalous X-ray Pulsar 4U 0142+61: Radiative and Timing Changes, Bursts, and Burst Spectral Features
• Broadband Spectral Investigations of SGR J1550-5418 Bursts
• An Extended Burst Tail from SGR 1900+14 with a Thermal X-ray Spectrum
• Spectral and timing properties of the magnetar CXOU~J164710.2-455216
• A Burst and Simultaneous Short-Term Pulsed Flux Enhancement from the Magnetar Candidate 1E 1048.1-5937
• Chandra observations of SGR 1627-41 near quiescence
• Hardness-Intensity Correlations in Magnetar Afterglows
• Extended Tails from SGR 1806-20 Bursts

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